Name: Chocolate Potato Cake
Ingredients: 1 cup butter or margarine, softened; 2 cups granulated sugar; 4 eggs; 2 squares unsweetened chocolate, melted; 1 teaspoon vanilla extract; 1 cup cold mashed potatoes; 2 cups sifted all-purpose flour; 1 teaspoon baking soda; ½ teaspoon salt; ¾ cup sour milk or buttermilk

Why it works: Vanilla and milk are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

Vanilla + milktop 5% of all pairs

Smell alikemoderate

Cooked together19,187 recipes

Shared aroma: ethyl caproate (fruity, apple peel).
Chocolate + vanillatop 5% of all pairs

Smell alikemoderate

Cooked together10,020 recipes

Shared aroma: sotolon (curry, maple).
Butter + milktop 7% of all pairs

Smell alikemoderate

Cooked together81,283 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Sugar + vanillatop 8% of all pairs

Smell alikelow

Cooked together35,032 recipes

Shared aroma: beta-damascenone (apple, rose).
Potato + milktop 9% of all pairs

Smell alikemoderate

Cooked together3,611 recipes

Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 recipes: they work on texture and structure more than aroma.

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Butter or margarine: Adds fat and richness, and creaming with sugar traps air for a tender crumb.
Eggs: Provide structure and binding, helping the cake set as it bakes.
Unsweetened chocolate: Supplies the chocolate flavor and deep color of the cake.
Cold mashed potatoes: Add moisture so the cake stays soft and moist.
All-purpose flour: Forms the main structure of the cake.
Baking soda: Reacts with the sour milk or buttermilk to produce gas that makes the cake rise.

The step that matters

Alternating flour and sour milk additions. Adding flour and liquid in alternating portions with thorough blending keeps the batter smooth and well emulsified, which helps give an even, tender crumb.

Swap the potato

How well each one fits the dish's main ingredients (butter, sugar, egg, chocolate, vanilla, flour, milk):

Arrowrootfits better
Sweet potatofits better
Capsicumfits about as well
Potatothe original

Fit is the average pairing score against butter, sugar, egg, chocolate, vanilla, flour, milk. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

Ingredient	Portion assumed	kcal
Flour	1 cup (125g) all-purpose	455
Potato	1 medium (173g) baked	161
Chocolate	1 oz (28g) semisweet	155
Sour Milk	1 cup (244ml) whole	149
Milk	1 cup (244ml) whole	149
Butter	1 tbsp (14g)	102
Egg	1 large egg (50g)	78
Sugar	1 tbsp (12.5g) granulated	49
Vanilla	1 tsp extract (4ml)	12
Salt	1 tsp (6g)	0

Chocolate Potato Cake